Add Python 3.13 to CI test matrix (replacing 3.12)

Signed-off-by: Mathias L. Baumann <mathias.baumann@frequenz.com>

Author: Marenz

.github/workflows/ci.yaml

@@ -35,7 +35,7 @@ jobs:
           - ubuntu-24.04
         python:
           - "3.11"
-          - "3.12"
+          - "3.13"
         nox-session:
           # To speed things up a bit we use the special ci_checks_max session
           # that uses the same venv to run multiple linting sessions
@@ -112,7 +112,7 @@ jobs:
           - ubuntu-24.04
         python:
           - "3.11"
-          - "3.12"
+          - "3.13"
     runs-on: ${{ matrix.os }}${{ matrix.arch != 'amd64' && format('-{0}', matrix.arch) || '' }}
 
     steps: